Scissors



A. T. YARD SGISSORS Filed Feb. 9. 1924 I Y y w I I I .V L f-LM' il??WENT M A 70W/mavo )7WD BY @a j- K @if/ATTO R NEY 'W Fa'tented Apr. 7,l925.

Ni'rso STATES ABRAM TOWNSEND YARD, OF MATLEWOOD, NEW JERSEY.

SCISSORS.

Application tiled February 9, 1924. Serial No. 691,541.

To all who/m, t may concern.'

Be it known that I, ABRAM TowNsnND YARD, a citizen of the United States,and a resident of Maplewood, county of Essex, State of New Jersey, haveinvented an Im'- provement in Scissors, of which the following is aspecification.

The present invention relates to an improvement in scissors-or shears,one object being to produce a device of the kind indicated which willhave an' interchangeable blade whereby a cutting portion of the scissorscan be removed and replaced at will and whereby a superior quality ofsteel or other suitable cutting metal may be employed in the blade.Inthe ordinary forms of scissors and shears, the permanent cuttingqualities of the blade must usually be sacrificed because it is notpossible to form the entire scissors of tool or other high grade steeleconomically by any known means of manufacture in large quantities.Accordingly, the scissors and shears in ordinary use are made ofrelatively soft steel and the cutting edges of the blades rapidlydeteriorate in use. According to my invention, it is contemplated that aportion of the scissors or shears not directly employed in cutting shallbe of a relatively light and easily formable material such as aluminum,for eX- ample, and the blade orl cutting portion shall be of high carbonsteel or other suitable hard metal and readily attachable to anddetachable from the frame ofthe scissors at will. In forms of scissorsheretofore known and in which the blade is intended to be detachable, ithas been found that the instrumentalities for effecting the attachmentof the blade to the scissors frame have been eithercumbersome ordefective in 0peration, or have been of such character that the cost ofproduction has rendered the devices employing these expedients too eX-pensive to successfully compete lwith the ordinary well known forms ofscissors and shears. Y

A preferred embodiment of my invention is illustrated in the drawingsaccompanying the present specification, and inwhich- Figure 1 is a topplan view` of a blade carrier,`

Figure 2, a side view thereof,

Figure 3, an edge view of a blade, Figure 4, a plan view of the bladeshown in Figure 3,

Figure 5, an edge view of a modified form of blade,

Figure 6, a plan view of the modification shown in Figure 5, Y

Figure 7, an enlarged detail in section on the line 7-7 of Figure 2,

Figure 8, a transverse section on the line 8 8 of Figure 2, and

Figure 9, a transverse section on the line 9-9 of Figure 2.

Referring' to the. drawings, scissors embodying my invention includebroadly a blade carrier 1 provided with a removable blade 2 and meanswhereby the blade 2 may be detachably secured to the blade carrier 1.

v In a preferred form of my improved device,

the carrier 1 is provided with opposed longitudinally extending undercutgrooves 3 and 4, each communicating with a tongue receiving recess 5.The blade 2 is provided with resilient projecting tongues 6 and 7preferably formed integrally with said blade by being struck out ofthematerial thereof.

As indicated more clearly in Figure 8, these tongues 6 and 7 aredisposed at an angle to each other, said angle correspondingsubstantially to the angle formed bet-Ween the axes of the correspondinggrooves in the carrier 1. Thus, whenl the parts are in assembledrelation, the tongues 7 engage groove 4 and the tongues 6 engage groove3. In assembling the parts, the tongues 6 and 7 are first inserted intherecess 5 and are then moved longitudinally with the blade into eectiveblade retaining position. As indicated more clearly in Figures 7, 8 and9, a preferred form of blade carrier will include flanges-8 and 9overlying their respective tongue receiving grooves, said flanges beingpreferably of increasing cross sectional area from one end to the otherof their ef.- fective tongue engaging length. Thus, as shown in Figure 7the fiange'S increases in cross sectional area from the recess throughwhich the tongues are inserted in the direction of movement of thetongues as they are moved into blade retaining position. Aocordingly, asthe tongues move forward in the direction of the arrow during theattaching operation, the under surface 10 of the flange 8 acts as a cambearing Vagainst the upper surface of the corresponding tongue anddepressing the same, thereby drawing they blade 2 into firm or pressedengagementv with the blade engaging sur- "held securely connectedthereto by a suitable bolt oi' other Well known means, the reinovableblades will be retained against endivise movement and therefore remainin fixed operative engagement with their respective carriers.

1n Figure rand 6, 1 have' illustrated aY modi'dcation including a blade11 'having tongues 12 and 13 performing substantially the saine'function as the tongues G and 7 ai'idcoopeiating in a similar mannerwith suitable grooves in a carrier such as the blade carrier 1. innaddition thereto, the carrier is provided with a recess 111 at the rearend of the blade receiving portion, said recess being positioned andadapted to receive andA engage a projection 15 struck dow'iifr'om thematerial of the blade l1. it is contemplated that a blade embodying thisconstruction Will be'i'nade of steel sufiiciently resilient to bendreadily Without permanent deformation so that the blade may be assembledon the blade carrier by engaging the tongues 12 and 13 in suitablerecessesfand then l'moving 'the blade longitudinally to- Ward the frontend of the blade carrier. During the first portion of this operation,vrearwar'dly disposed portions off the lower surface oithe blade willride on the shoulder 16 of. the blade carrier and as the bladeapproaches operative position, will slip downy into engagement with theblade engaging surface oiE the carrier and in such position that theprojection 15 will lit into the recess 14;, thus aifording"additionalsecurity against endwisemovement ofthe blade. Y

b'viouS'ly, difl'erent conditions of use or various sizes of scissors-oi vshears will indi-- cate variationse'in construction from tliede-'tails hereinabove described. Thus, in soine correspondingly increasednumber of 1 sets of tonguesti and'7 Furthermore, varying 'conditionsmay-indicate the necessity for varying the relative sizes or lengths ofthe toi g es and their cooperating grooves, it being contemplated thatin soineecases relatively vlong tongues will be more appropriate thanshorter tongues. tion as to Ythese details of construction, it isbelieved that the saine ivill still be properly considered Within thescope or niy invention as disclosed in the drawings and defined in theclaims appended hereto.

l claim as my invention: f

1. Scissors comprising a blade carrier having Ylongitudinally extendingundercutgrooves opening' in the blade engaging face -ofsaid carrier andatongue receiving recess coin'niunieating With said undercut grooves,'and a blade liavingtongues progecting from one :tace thereof andpositioned to engage said grooves to retain the blade in pressedengagement with the carrier.

2. Scissors including a blade carrier having a 'longitudinally extendingslot in its blade engaging face and opposed undercut grooves openinginto said slot, and a blade having spaced pairs of opposed resilienttongues engaging said undercut grooves to hold the blade in pressedengagement With the carrier. Y* Y c 3. Scissors comprising a bladecarrier having longitudinally extending undercut grooves opening in theblade engaging tace of said carrier and a tongue receiving recesscommunicating with said undercut grooves and exposing openends thereofand a blade liaifing oppositely extending tongues adapted to enter saidrecesses and to be moved longitudinally into sliding engagement withsaid. respective undercut. grooves through said open ends.

fl. Scissors comprising a blade carrier having spaced tongue receivingrecesses in its bladeengaging face, a longitudinally extending undercutgroove communicating with each of said recesses, and tongues on thelblade positioned Yand adapted to enter said recesses and to be movedlongitudinally into sliding engagement with saidV respective undercutgrooves through said open ends.

i 5. Scissors Ycomprising a blade carrier Yhaving spaced tonguereceiving recesses in its blade engaging face, a longitudinallyextending undercut groove communicating with each or jsaid recesses, andtongues on lthe blade positioned and adapted to enter said recesses andto be moved longitudinally into blade retaining engagement With saidrespective grooves. Y

6. Scissors comprising ja blade carrier having a tongue receivingrecess, undercut grooves extending longitudinally or" said carrier andopening into said recess, and a tongue retaining flange overlyingeach ofsaid grooves ando'i' Vprogressively increasing cross sectional area fromoneend toward the other of its effective length.

lf/Y-liatevei the varia- 7. Scissors comprising a blade carrier having atongue receiving recess, undercut grooves extending longitudinally ofsaid carrier and opening into said recess, and a tongue retaining flangeoverlying each of said grooves and of progressively increasing crosssectional area from said recess toward the other end of its effectivelength.

8. Scissors comprising a blade carrier having a tongue receiving recess,undercut grooves extending longitudinally of said carrier and openinginto said recess, a

tongue retaining flange overlying each of said grooves, and a bladehaving resilient tongues adapted to engage the under faces of saidrespective flanges With increasing pressure as the tongues are movedlongitudinally along said grooves into effective blade retainingposition.

In testimony whereof, I have signed my 2G A. TOVVNSEND YARD.

